nao da pra ativar o DMA

[carne_de_passaro]

É o seguinte, eu estava usando o kernel 2.6.11, normalmente, acontece que pra eu instalar minha placa da nvdia eu tive que recompilar o kernel, mas quando eu recompilei o kernel eu só havia mudado o item correspondente em graphics (riva_fb support), quando eu fui utilizar o kernel que eu acabara de recompilar, quase tudo funcionando direito exceto pela hd q estava com o dma desativado, entao eu usei:

bash-3.00# hdparm -d1 /dev/hda

/dev/hda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma = 0 (off)

o q eu devo fazer para ativar o dma? Lembrando q o suporte a dma esta ativado no kernel

abaixo algumas informaçoes sobre a minha hd:

bash-3.00# hdparm -i /dev/hda

/dev/hda:

Model=ST380011A, FwRev=3.06, SerialNo=5JV61KTF
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=65535/1/63, CurSects=4128705, LBA=yes, LBAsects=156301488
IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio2 pio3 pio4
DMA modes: mdma0 mdma1 mdma2
UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5
AdvancedPM=no WriteCache=enabled
Drive conforms to: ATA/ATAPI-6 T13 1410D revision 2:

* signifies the current active mode

bash-3.00# hdparm -I /dev/hda

/dev/hda:

ATA device, with non-removable media
Model Number: ST380011A
Serial Number: 5JV61KTF
Firmware Revision: 3.06
Standards:
Used: ATA/ATAPI-6 T13 1410D revision 2
Supported: 6 5 4 3
Configuration:
Logical max current
cylinders 16383 65535
heads 16 1
sectors/track 63 63
--
CHS current addressable sectors: 4128705
LBA user addressable sectors: 156301488
LBA48 user addressable sectors: 156301488
device size with M = 1024*1024: 76319 MBytes
device size with M = 1000*1000: 80026 MBytes (80 GB)
Capabilities:
LBA, IORDY(can be disabled)
bytes avail on r/w long: 4 Queue depth: 1
Standby timer values: spec'd by Standard
R/W multiple sector transfer: Max = 16 Current = 16
Recommended acoustic management value: 128, current value: 0
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=240ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* READ BUFFER cmd
* WRITE BUFFER cmd
* Host Protected Area feature set
* Look-ahead
* Write cache
* Power Management feature set
Security Mode feature set
SMART feature set
* FLUSH CACHE EXT command
* Mandatory FLUSH CACHE command
* Device Configuration Overlay feature set
* 48-bit Address feature set
SET MAX security extension
* DOWNLOAD MICROCODE cmd
* SMART self-test
* SMART error logging
Security:
supported
not enabled
not locked
not frozen
not expired: security count
not supported: enhanced erase
HW reset results:
CBLID- above Vih
Device num = 0 determined by CSEL
Checksum: correct

[carne_de_passaro]

bom, agora eu estou com o dma ativado , mas não sei qual era o problema.
o que eu fiz foi (re)compilar o kernel 2.6.12 (antes eu estava com o 2.6.11)
e deixei ativado as mesmas opções relativas ao dma que eu havia ativado no outro kernel, e simplesmente funcionou, o que era esperado.

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